Blower Wheel Type Forward-Curved Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 7 3/4 in Airflow @ 0.125 in SP 1 053 cfm Airflow @ 0.250 in SP 1 006 cfm Airflow @ 0.375 in SP 961 cfm Airflow @ 0.500 in SP 918 cfm Airflow @ 0.750 in SP 829 cfm Airflow @ 1.000 in SP 727 cfm Airflow @ 1.250 in SP 582 cfm Airflow @ 1.500 in SP Not Applicable Airflow @ 2.000 in SP Not Applicable Airflow @ 2.500 in SP Not Applicable